<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>2_回调函数形式的ref</title>
    </head>
    <body>
        <!-- 准备好一个“容器” -->
        <div id="test"></div>

        <!-- 引入react核心库 -->
        <script type="text/javascript" src="../js/react.development.js"></script>
        <!-- 引入react-dom，用于支持react操作DOM -->
        <script type="text/javascript" src="../js/react-dom.development.js"></script>
        <!-- 引入babel，用于将jsx转为js -->
        <script type="text/javascript" src="../js/babel.min.js"></script>

        <script type="text/babel">
            //创建组件
            class Demo extends React.Component {
                //展示左侧输入框的数据
                showData = () => {
                    //解构赋值
                    const {input1} = this
                    alert(input1.value)
                }
                //展示右侧输入框的数据
                showData2 = () => {
                    const {input2} = this
                    alert(input2.value)
                }

                //ref={c => this.input1 = c} c是参数，可以是任意名称 相当于 把参数赋值给 input1，此处为input 节点
                render() {
                    return (
                        <div>
                            <label>
                                <input ref={c => this.input1 = c} type="text" placeholder="点击按钮提示数据"/>
                            </label>
                            &nbsp;
                            <button onClick={this.showData}>点我提示左侧的数据</button>
                            &nbsp;
                            <label>
                                <input onBlur={this.showData2} ref={a => this.input2 = a} type="text"
                                       placeholder="失去焦点提示数据"/>
                            </label>
                            &nbsp;
                        </div>
                    )
                }
            }

            //渲染组件到页面
            ReactDOM.render(<Demo a="1" b="2"/>, document.getElementById('test'))
        </script>
    </body>
</html>